Typical air vs. spike days
- Annual average PM2.5 (8.60 µg/m³) reflects usual daily exposure.
- Worst-day peak PM2.5 (43.73 µg/m³) is what filtration must handle during bad-air events.
Sections below reference one or both metrics on purpose — that is how HVAC vs. portable guidance differs for Crowley without contradicting EPA-aligned thresholds.
Seasonal Loads and Local Geography
Seasonal loads in the area are dominated by heavy pollen cycles. Local vegetation and the open geography of the region allow wind-borne allergens like mountain cedar and ragweed to travel long distances. These particles act as a physical load on your HVAC filter, often filling the pleats long before the filter's rated lifespan is over. Humidity also plays a role in mold growth, which adds another layer of biological material to the air your system must process. Regular filter changes are necessary to prevent these allergens from recirculating through your home.
HVAC Filter Recommendations
For homes in this area, a MERV 13 filter is the professional choice. Given that PM2.5 maxes out at 43.73 µg/m³, a standard MERV 8 or fiberglass filter will not catch the fine particulates that cause the most irritation. Because ozone peaks also reach 0.0886 ppm, I suggest a filter that includes an activated carbon layer to help scrub odors and gases. Change these filters every 60 to 90 days. In North Texas, the combination of fine clay dust and high pollen counts can lead to pressure drops in your system if filters are left in too long, potentially damaging the blower motor and increasing your utility bills.